Prick pastry shell with tines of a fork; bake in 450-degree oven 5 minutes. Drain salmon, reserving liquid. Remove bones and skin. Flake salmon and place in bottom of pastry shell. Sprinkle with lemon juice. Saute onions and parsley flakes in butter; sprinkle over salmon. Mix liquid from salmon with eggs, milk, Season-All and pepper. Pour over salmon. Bake in 350-degree oven 50 minutes or until firm. Serve hot. Makes 4 to 6 servings.